Question

which formula is this?​

Answer 1

The particular circle marked equation is not any formula .

But $\bf{πr²}$ is the formula to calculate the area of a circle

$\implies π$ = $\frac{22}{7}$ or $3.14$

$\implies r$ = radius of the circle

Answer 2

Step-by-step explanation:

The particular circle marked equation is not any formula .

But πr² is the formula to calculate the area of a circle

⟹π = 22/7 or 3.14

⟹r = radius of the circle

Hope this helps you!!